21653042546633 has 4 divisors (see below), whose sum is σ = 21671284369680. Its totient is φ = 21634800723588.

The previous prime is 21653042546563. The next prime is 21653042546753. The reversal of 21653042546633 is 33664524035612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21653042546633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21653042546533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9120909743 + ... + 9120912116.

It is an arithmetic number, because the mean of its divisors is an integer number (5417821092420).

Almost surely, 2^{21653042546633} is an apocalyptic number.

It is an amenable number.

21653042546633 is a deficient number, since it is larger than the sum of its proper divisors (18241823047).

21653042546633 is a wasteful number, since it uses less digits than its factorization.

21653042546633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18241823046.

The product of its (nonzero) digits is 9331200, while the sum is 50.

The spelling of 21653042546633 in words is "twenty-one trillion, six hundred fifty-three billion, forty-two million, five hundred forty-six thousand, six hundred thirty-three".